JPH0148185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control force retention device for a vehicle.

For example, in a torque converter vehicle, the vehicle will move forward at low speed unless the vehicle brakes due to the creep phenomenon when stopped, such as when waiting at a traffic light, or sets the torque converter range to neutral or park. Especially when the engine speed is high and the engine speed is high when the chiyoke valve is activated, the vehicle moves forward at a fast speed.

Conventionally, a tamp that seals in the brake fluid has been proposed as a countermeasure to the above problem, but with this method, once the brake pedal is depressed, the position of the master cylinder where the fluid pressure increases moves, and the cup is placed in the hole leading to the reservoir. It will pass in an inflated state. Therefore, there was a drawback that the swollen cup could get scratched.

Furthermore, when the brakes are applied and the vehicle stops for approximately 2 seconds, an electric shaft stone is energized and adsorbed to a suction plate, thereby preventing the brake pedal from being pressed back. 54
This is proposed in Publication No. 7100, etc. With this device, if the braking force is insufficient after the first depression, even if you try to apply the brakes again, the brake pedal is fixed and cannot be depressed again, so you can de-energize the electromagnet by depressing the accelerator pedal. The brakes cannot be reapplied unless the switch is activated or another signal is applied.
Of course, if the brake is applied again while the electromagnet is still energized, the adsorption plate that is attracted to the electromagnet will slip, but if this situation is repeated, the adsorption plate will become severely worn out, which is not desirable.

The previously proposed Japanese Patent Publication No. 56-32134 shows a foot-operated parking brake, but this one uses a torsion coil spring to replace the boss section, which is provided concentrically with the center of rotation of the pedal. Since the pedal is configured to be tightened by the pedal, a large torque is applied to the pedal due to the return spring and the brake reaction force, so a torsion coil spring with a large spring force must be used, which causes the movement of the torsion coil spring. A large force is required to hold the side end, and in order to move the movable end of the torsion coil spring to the side where the diameter of the spring is enlarged, it is necessary to resist the holding force. A large force is required, and a large operating force is required for release, and when electromagnetic force is used as a means for this, for example, there are problems in that the solenoid coil becomes large and the pedal becomes heavy.

The present invention solves the above-mentioned conventional drawbacks by attaching a coil spring to the shaft member that allows the shaft member to rotate in one direction, and applies an initial frictional force to the shaft member so that it wraps around the shaft member when the shaft member rotates in the other direction. If the coil springs are fitted together, one end of the coil spring is fixed, and the other end is locked to prevent movement toward the side where the inner diameter is reduced. ), due to the frictional force between the outer peripheral surface of the shaft member and the inner peripheral surface of the coil spring, the other end moves to the side that expands the inner diameter, expanding the inner diameter, and as a result, the shaft member slides. is allowed to rotate,
When rotating in the other direction (when one end is on the rotation side), since one end is fixed, the friction force causes a spring to be wrapped around the outer circumferential surface of the shaft member, reducing the inner diameter. Since rotation of the shaft member is prevented and it acts as a one-way clutch, this problem is solved by using this spring-type one-way clutch. It has a rack gear for converting circular arc motion into rotational motion, and a pinion gear that is rotatably supported on the vehicle body and meshes with the rack gear at one end, and rotates in one direction when the brake pedal is depressed and when the brake pedal is released. When the shaft member is rotated in one direction, the shaft member is allowed to rotate, and when the shaft member is rotated in the other direction, an initial frictional force is applied that causes the shaft member to wrap around the shaft member. a coil spring fitted to the member; a stopper fixed to the rack gear and engaging one end of the coil spring to prevent the coil spring from moving in a direction in which the inner diameter of the coil spring is reduced; An operating mechanism including a movable engagement member fixed to the other end, an operating state in which the engaging member is moved to move the other end of the coil spring to a side where the inner diameter thereof is enlarged, and an opposite operating state thereof. It is an object of the present invention to provide a braking force holding device for a vehicle, which comprises a drive source that selectively controls the actuating mechanism.

The present invention also provides a control force holding device for a vehicle, including a rack gear for converting the arc motion of the brake pedal into rotational motion in conjunction with depression of the brake pedal; A shaft member that has a pinion gear that meshes with the shaft member and is rotated in one direction when the brake pedal is depressed and rotated in the other direction when the brake pedal is released, and the shaft member is allowed to rotate when the shaft member rotates in the one direction. When rotating in the other direction, an initial frictional force is applied to wrap around the shaft member, causing the coil spring fitted to the shaft member and moving one end of the coil spring fixed to a member fixed to the vehicle body. an actuating mechanism that includes a stopper that fixes the coil spring irreversibly; an engagement member that engages with the other end of the coil spring to prevent the coil spring from moving in a direction in which the inner diameter of the coil spring is reduced; and an engagement member that is movable; A braking force for a vehicle comprising a drive source that selectively controls the actuation mechanism between an actuation state in which a member is moved and the other end of the coil spring is moved to the side where the inner diameter thereof is expanded, and a non-operation state in which the actuation mechanism is reflected. It is intended to provide a holding device.

Since the present invention is configured as described above, there is no risk of damaging the cup of the master cylinder, and there is no need for an intermediate hub like in the past, and the structure is very simple, and serviceability and safety are high. It can be manufactured at low cost. In addition, the pedal is held by a self-leading action (for one-way clutches), which prevents the rotation of the shaft member, which is accelerated by the rotational force at the center of rotation of the pedal, through the rack gear and pinion gear. Instead of the large torque generated by the spring, a coil spring having a small spring force sufficient to block the small rotational torque of the shaft member is sufficient, and the operating mechanism can be miniaturized.

Embodiments of the present invention will be described below with reference to the drawings. First, in the first embodiment shown in FIG. 4 pushes the piston of a master cylinder (not shown) to generate braking force.

Reference numeral 5 denotes a rack gear which can swing around a bolt 7 on a bracket 6 fixed to the dash board 2. Teeth 8 are provided on the upper edge of the central window, and a pinion gear 9 meshes with the teeth 8. . The pinion gear 9 is rotatably loosely fitted to a shaft 10 fixed to the bracket 6, and the shaft member 9a (FIG. 3) provided on the pinion gear 9 has a
A coil spring 11, which together with a forms a spring-type one-way clutch, is wound.

The coil spring 11 allows the shaft member 9a to rotate when the shaft member 9a rotates in one direction (the direction in which the brake pedal 1 is depressed), and wraps around the shaft member 9a when the shaft member 9a rotates in the other direction (the direction in which the brake pedal 1 returns). The shaft member 9a is given an initial frictional force such as
In FIG. 1, it is fitted onto the shaft member 9a so that it is wound around the outer circumferential surface of the shaft member 9a from one end 13 clockwise and toward the front in the paper. Also, one end 1 of the coil spring 11
3 is locked to a stopper 12 provided on the rack gear 5 so as to prevent movement toward the side where the inner diameter decreases (leftward in FIG. 1), and the other end 1
4 is engaged with an engaging member 16 of a vacuum actuator 15 which is an actuation mechanism in the present invention. The engaging member 16 is moved by selectively controlling the vacuum actuator 15 between an activated state and a non-operative state by a vacuum which is a driving source in the present invention. As a result, the shaft member 9
a and the coil spring 11, when the brake pedal 1 is depressed and the shaft member 9a rotates in the direction a in FIG. Since the winding between the coil spring 11 and the outer peripheral surface is in the direction of loosening, one end 1 of the coil spring 11
3 is moved rightward in FIG. 1, the inner diameter of the coil spring 11 is expanded, thereby allowing the shaft member 9a to rotate while sliding. Further, when the brake pedal 1 is returned and the shaft member 9a rotates in the direction b in FIG. 1, the coil spring 11 tries to rotate together with the shaft member 9a, but the other end 14 of the coil spring 11 Since the coil spring 11 is engaged with the 15 engagement members 16, the coil spring 11 is wound more tightly due to the frictional force.
A spring-type one-way clutch is constructed in which the inner diameter of the shaft member 9 is reduced to prevent rotation of the shaft member 9.

Furthermore, when the vacuum actuator 15 is operated to cause the engagement member 16 to protrude leftward in FIG. The end 14 moves to the left in the loosening direction to expand the inner diameter of the coil spring 11, so that the coil spring 11 is moved to the left when the shaft member 9a is in the position b in FIG.
Even if the brake pedal 1 rotates in the direction, the shaft member 9a is freely rotated without being wrapped around the shaft member 9a, and the brake pedal 1 is returned from a control force holding position to a non-operating position by the biasing force of a return spring. When the vacuum actuator 15 is not in operation, the engaging member 16 is retracted by a spring (not shown) to occupy the position shown in FIG. The engaging member 16 is made to protrude against the force.

Next, the operation of the embodiment shown in FIG. 1 will be explained.
When the brake pedal 1 is depressed, the pedal 1 swings to the left about the pin 3, and a braking force is generated in a master cylinder (not shown) via the push rod 4. At the same time, the rack gear 5 swings in the same direction using the bolt 7 as a fulcrum via the link bar 17 pivotally connected to the brake pedal 1, and its teeth 8
The pinion gear 9 that meshes with the shaft rotates on the shaft 10 in the direction of the arrow a in FIG. This direction a is the direction in which the coil spring 11 loosens on the pinion gear 9,
The opposite arrow b direction is the winding direction.

As mentioned above, the direction of arrow a is the coil spring 1.
Since the winding of the brake pedal 1 is in the direction of loosening, the pinion gear 9 freely rotates clockwise in synchronization with the depression of the brake pedal 1, and the pedal 1 can be depressed without any trouble. At this time, the engaging member 16 is made to protrude to the illustrated position.

Next, when you stop pressing brake pedal 1,
The pedal 1 begins to return due to the return spring, and the pinion gear 9 also begins to rotate in the counterclockwise direction of arrow b via the teeth 8 of the rack gear 5. In the direction of arrow b, the coil spring 11 is attached to the pinion gear 9.
Since the coil spring 11 is wound in the direction in which Since the member 16 protrudes, the other end 14 comes into contact with this engaging member 16 and the winding of the spring around the pinion gear 9 is loosened, so the pinion gear 9 can rotate in the opposite direction and the brake pedal 1 also returns to its original position. I can go back. In order to maintain the braking force at this time, it is sufficient to retract the engaging member 16 and apply the brake.

Furthermore, if the brake pedal 1 is not sufficiently depressed at this time and the vehicle moves forward at a low speed, the fixed brake pedal 1 may be depressed again. At this time, the pinion gear 9 is again moved by the arrow a.
When the pinion gear 9 tries to rotate in the direction of the arrow b again, the brake pedal 1 is fixed at the re-depressed position, Control is maintained.

Next time you try to release the braking force,
When the vacuum is supplied to the left chamber of the vacuum actuator 15, the engagement member 16 protrudes against the spring (not shown), and the coil spring 11
In order to lock the left side of the other end 14, the pinion gear 9 is moved by the return spring of the brake pedal 1.
Even if the brake pedal starts rotating in the direction of arrow b, the coil spring 11 cannot prevent the pinion gear 9 from rotating in the opposite direction, and the brake pedal 1 can return to its normal non-operating position.

Next, FIGS. 2 and 3 show a second embodiment, in which, unlike the case shown in FIG. 1, the teeth 8' of the rack gear 5' mesh with the pinion gear 9 from above. Therefore, when the brake pedal 1 is depressed in the direction of arrow B, the pinion gear 9 rotates counterclockwise via the rack gear 5', which is opposite to the case shown in FIG. One end 13 of the coil spring 11 is fixed to a stopper 12, and the other end 14 is attached to a pin 21 at the tip of a link 19 which is an engaging member of the present invention, which will be described later. Since it is locked, the coil spring 11
is the loosening direction, and clockwise is the winding direction.

The engagement member that prevents this winding is made up of two links 19 and 20 that are pivotally supported by a pin 18, and a pin 21 at the tip of the link 19 is attached to the other end 14 of the coil spring 11 as shown in FIG. It is designed to hit from the bottom side of the link and push it upward.
A pin 22 at the tip of 0 is pivotally attached to the bracket 6, and a manual lever 23 is fixed to the pin 22.

Reference numeral 24 denotes a solenoid, which is the operating mechanism of the present invention, and its plunger 25 is pivotally connected to the pin 18. When current, which is the drive source of the present invention, flows through the solenoid 24 through the lead wire 26, the plunger 25 protrudes, and the link 19 and 20 are substantially in a straight line as shown by the two-dot chain line, the pin 21 moves upward, and the coil spring 11 is loosened so that it winds even when the pinion gear 9 rotates clockwise. As mentioned above, although some of the structures are different from those in FIG. 1, there is no difference in operation and effect. Note that the solenoid 24 may be a vacuum actuator.

FIG. 4 shows an embodiment different from the embodiment shown in FIG.
The engaging member 27 has a cam portion 29 that engages with the other end 14 of the coil spring 11 and a manual lever portion 30. There is no difference in case and effect.

As explained in detail above, the present invention is configured to prevent the rotation of the pinion gear which is accelerated by the rotational force at the center of rotation of the brake pedal. Instead, it is only necessary to provide a coil spring having a small spring force that can prevent the small rotational torque of the pinion shaft, and therefore the operating mechanism can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a side view of a braking force holding device for a vehicle showing an embodiment of the present invention, FIG. 2 is a side view showing another embodiment, FIG. 3 is a sectional view taken from A to A in FIG. The figure is a side view showing still another embodiment. Explanation of the main parts of the diagram, 1...brake pedal,
2... Dashboard, 3... Pin, 4... Push rod, 5... Rack gear, 6... Bracket, 7... Bolt, 8... Teeth, 9... Pinion gear, 11... Coil spring, 12... Stopper. , 14...other end, 15... vacuum actuator (actuation mechanism), 16... locking member, 19,
20... Link (locking member), 24... Solenoid (operating mechanism).

Claims (1)

[Scope of Claims] 1. A braking force retention device for a vehicle, comprising: a rack gear for converting the arc motion of the brake pedal into rotational motion in conjunction with depression of the brake pedal; a shaft member having a pinion gear that meshes with the rack gear, and is rotated in one direction when the brake pedal is depressed and rotated in the other direction when the brake pedal is released;
a coil spring that is fitted to the shaft member by applying an initial frictional force that allows the shaft member to rotate when the shaft member rotates in the one direction and wraps around the shaft member when the shaft member rotates in the other direction; A stopper fixed to the rack gear and fixed to one end of the coil spring to prevent the coil spring from moving toward the side where the inner diameter is reduced; and a movable engagement fixed to the other end of the coil spring. an actuation mechanism provided with a member; and an actuation mechanism in which the engaging member is moved to move the other end of the coil spring to a side where the inner diameter thereof is enlarged, and the actuation mechanism is selectively put into an inoperative state, which is the opposite operation. A braking force retention device for a vehicle, comprising a drive source to be controlled. 2. A braking force holding device for a vehicle includes a rack gear for converting the circular arc motion of the brake pedal into rotational motion in conjunction with depression of the brake pedal, and a pinion gear rotatably supported by the vehicle body and meshing with the rack gear at one end. a shaft member having a shaft member which is rotated in one direction when the brake pedal is depressed and rotated in the other direction when the brake pedal is returned;
a coil spring fitted to the shaft member that allows rotation of the shaft member when the shaft member rotates in the one direction, and applies a cut-off frictional force that causes the shaft member to wrap around the shaft member when the shaft member rotates in the other direction; a stopper that is fixed to a member fixed to the vehicle body and immovably fixes one end of the coil spring; and a stopper that locks the other end of the coil spring to prevent the coil spring from moving in a direction where the inner diameter of the coil spring is reduced. an actuating mechanism provided with an engaging member movable with the coil spring; an actuating state in which the engaging member is moved to move the other end of the coil spring to a side where the inner diameter thereof is enlarged; A braking force retention device for a vehicle, comprising a drive source that selectively controls an operating mechanism.